President Trump Donald John TrumpREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails Trump urges North Korea to denuclearize ahead of summit Venezuela's Maduro says he fears 'bad' people around Trump MORE's former campaign manager, Corey Lewandowski, met with Senate Intelligence investigators on Wednesday as part of the panel's ongoing probe into Russian interference in the 2016 election, according to multiple reports.

The meeting with committee staff reportedly lasted for more than three hours, The Washington Post reported.

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Lewandowski, an early staff hire who served as Trump's top campaign head until June 2016, joins a growing list of current and former top Trump aides who have been interviewed by the panel. Others include Lewandowski's successor Paul Manafort and the president's senior adviser and son-in-law Jared Kushner.

Earlier this year, Lewandowski denied colluding with Russian officials or having any such contact.

"I have never colluded, cooperated or contacted any Russians that I’m aware of. Nobody contacted me that I am aware of and asked to help solicit or fix the presidential campaign," Lewandowski told NBC in July.

Lewandowski still worked for the Trump campaign when Donald Trump Jr., Kushner and Manafort met with a Russian lawyer in June 2016 in an attempt to get damaging information about Hillary Clinton Hillary Diane Rodham ClintonREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails County GOP in Minnesota shares image comparing Sanders to Hitler Holder: 'Time to make the Electoral College a vestige of the past' MORE's campaign.

Lewandowksi said he wasn't "invited to the meeting," which occurred around the time he was battling it out with Manafort for power on the campaign.

Sen. Richard Burr (R-N.C.), the chairman of the Senate Intelligence Committee, and Sen. Mark Warner (Va.), the top Democrat on the panel, said in a press conference earlier this month that the committee is expanding the scope of its investigation into Russian meddling.

The Justice Department and several congressional panels are leading investigations into whether President Trump's campaign aides colluded with the Russians and the extent of Russian interference in the 2016 presidential election.

A spokeswoman for Burr declined a request for comment on the matter. Lewandowski and a spokeswoman for Warner did not immediately respond to requests for comment.